<div class="search">
    <form id="searchform" class="searchform" method="get" action="<?php echo home_url('/');?>">
        <input class="searchInput" type="text" value="<?php the_search_query();?>" name="s" id="s">
        <input class="searchBtn" id="searchsubmit" type="submit" value="搜索">
    </form>
</div><!--.search-->